﻿// This file is part of My Nes
//
// A Nintendo Entertainment System / Family Computer (Nes/Famicom)
// Emulator written in C#.
// 
// Copyright © Alaa Ibrahim Hadid 2009 - 2019
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.If not, see<http://www.gnu.org/licenses/>.
// 
// Author email: mailto:ahdsoft@online.de
//
namespace MyNes.Core
{
    [BoardInfo("74161/32", 96, 1, 32)]
    // TODO: Mapper 96: Not implemented well and needs special controller.
    class Mapper096 : Board
    {
        private int flag_c;

        internal override string Issues { get { return MNInterfaceLanguage.IssueMapper96; } }
        internal override void HardReset()
        {
            base.HardReset();
            flag_c = 0;
            Switch04KCHR(3, CHRArea.Area1000);
        }
        internal override void WritePRG(ref ushort address, ref byte data)
        {
            Switch32KPRG(data & 0x3, PRGArea.Area8000);
            flag_c = (data & 0x4) == 0x4 ? 0x01 : 0;
            Switch04KCHR(3, CHRArea.Area1000);
        }
        internal override void OnPPUAddressUpdate(ref ushort address)
        {
            if ((address & 0x03FF) < 0x03C0 && (address & 0x1000) == 0x0000)
                Switch04KCHR(((address & 0x0300) >> 8) | flag_c, 0x0000);
        }
        internal override void WriteStateData(ref System.IO.BinaryWriter stream)
        {
            base.WriteStateData(ref stream);
            stream.Write(flag_c);
        }
        internal override void ReadStateData(ref System.IO.BinaryReader stream)
        {
            base.ReadStateData(ref stream);
            flag_c = stream.ReadInt32();
        }
    }
}
